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Fire-retardant additives are used to decrease the burning rate of both flexible and rigid polyurethane foams. They may operate across several mechanisms, one being to increase char formation. A fire-barrier material has components that form a rigid, self-supporting resistive material that remains after the polymer has completely degraded. The resistive material may be of ceramic nature, where the ceramic forms by fusion of inorganic fillers with a transient liquid phase that is called an adhesive or flux component. During the transition from an organic polymer to a ceramic the material must retain its shape so that it can effectively provide a barrier against transfer of fire into nearby zones in a building, vehicle, equipment facility or safety zone for people.
Source : Wong, S. and Shanks, R., “Fire-Retardant and Fire-Barrier Polyurethane Foam Sealants Containing a Ceramifying Filler Composition for Structural Integrity”, 7th Asian-Australian Conf. on Composite Materials, Taipei, Taiwan, November 15-18, 2010.